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1. Equipment in a Coal Laboratory

2. Temco Brand Equipment in a Coal Laboratory

3. Equipment in a Coal Laboratory

4. Equipment in a Coal Laboratory

5. Equipment in a Coal Laboratory

6. Equipment in a Coal Laboratory

7. Equipment in a Coal Laboratory

Hewittic Rectifier changes AC to DC current.

8. Hewittic Rectifier at Jamison Coal Mine No. 9 Laboratory

Hewittic Rectifier changes AC to DC current.

9. Hewittic Rectifier at Jamison Coal Mine No. 9 Laboratory

10. Coal Lab Equipment at the Arkwright Laboratory

11. Coal Lab Equipment at the Arkwright Laboratory

12. Oven in a Coal Analysis Lab, Probably Arkwright Laboratory

13. Coal Testing Oven, Probably at the Arkwright Laboratory

14. Coal Lab Equipment at the Arkwright Laboratory

15. Coal Lab Equipment at the Arkwright Laboratory

16. Coal Lab Equipment at the Arkwright Laboratory

17. Interior of a Coal Lab, Probably Arkwright Laboratory.

18. Coal Lab Equipment at the Arkwright Laboratory

19. Coal Analysis Lab Equipment

20. Machinery at a Coal Mine in Thomas, W. Va.

21. Coal Analysis Lab Equipment

Machinery at a Thomas, W. Va. coal mine.

22. Guards at the Thomas, W. Va. Plant

23. Coal Analysis Lab Equipment

Man standing in a lab with lots of machinery. 'U.S. Bureau of Mines Photo Proof Print.'

24. Mine Machinery

Two men work in the Arkwright Quality Control Lab.

25. Arkwright Quality Control Lab

Company workers hard at work on a variety of machines.

26. Interior View of Laird Engineering Co. Machine Sho p